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The UVP Inc. UVX Radiometer Model UVX-31 allows measurement  of UV intensities.  With an digital readouts in radiometric units in a broad dynamic range allows for accuracy and precision. 

Features: 

• Three sensitivity ranges covering the span from 200 µW/cm2 to 20 mW/cm2
  
• 3-1/2 digit liquid crystal display readout
  
• Sensitivity down to 0.1 µW/cm2
  
• Outstanding ruggedness and reliability
  
• Negligible sensitivity to infrared
  
• Linearity of ± 1% over the total range, ± one digit
  
• Light weight
  
• Fully interchangeable sensors for full UV band coverage
  
• Automatic circuit that tests the display each time the unit is turned on
  
• Read/Hold switch that allows holding any reading indefinitely
  
• Automatic reverse battery connection protection circuit
  
• Remote sensor of small size permitting measurements to be taken in constricted
  areas
  

Specifications: 

• Electrical requirements: 9V
  
• Conversion rate: 2.8 readings/sec
  
• Display: 3.5 digit LCG
  
• Accuracy: ±2.5%
  
• Linearity: ±0.2%
  
• Temperature coefficient: ±0.025%/°C ± 1 digit, 0 to 50°C
  
• Zero Drift: ±0.02 uW/cm2/°C nominal 0 to 50°C
  
• Battery life: 120H
  
• Accuracy: ±5%
  
• Linearity: ±1.0%
  
• Temperature Coefficient: ±0.04%/°C nominal, 0 to 40°C
  
• Temperature: 0 – 50°C
  
• Humidity: 5% – 90% RH